//效果见JSBin https://jsbin.com/xivutud/edit?html,css
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Flex Deom</title>
  <style>
  .box {
      width: 50px;
      height: 50px;
      line-height: 50px;
      margin: 10px;
      text-align: center;
      background-color: yellow;
    }
    .flex {
      display: flex;  
    }
    .direction-row {
      flex-direction: row;
    }
    .direction-row-reverse {
      flex-direction: row-reverse;
    }
    .direction-column {
      flex-direction: column;
    }
    .direction-column-reverse {
      flex-direction: column-reverse;
    }
    .nowrap {
      flex-wrap: nowrap;
    }
    .wrap {
      flex-wrap: wrap;
    }
    .wrap-reverse {
      flex-wrap: wrap-reverse;
    }
    .flex-flow {
      flex-flow: row-reverse wrap;
    }
    .flex-start {
      justify-content: flex-start;
    }
    .flex-end {
      justify-content: flex-end;
    }
    .center {
      justify-content: center;
    }
    .space-between {
      justify-content: space-between;
    }
    .space-around {
      justify-content: space-around;
    }
    .box-wrap {
      width: 100%;
      height: 300px;
      box-sizing: border-box;
      border: 1px solid red;
    }
    .box-stretch {
      margin: 10px;
      text-align: center;
      background-color: yellow;
    }
    .items-stretch {
      align-items: stretch;
    }
    .items-flex-start {
      align-items: flex-start;
    }
    .items-flex-end {
      align-items: flex-end;
    }
    .items-center {
      align-items: center;
    }
    .items-baseline {
      align-items: baseline;
    }
    .box-wrap2 {
      width: 50px;
      height: 200px;
      border: 1px solid green;
    }
    .box2 {
      width: 50px;
      height: 50px;
      line-height: 50px;
      text-align: center;
      box-sizing: border-box;
      border: 1px solid blue;
      background-color: yellow;
    }
    .content-stretch {
      flex-wrap: wrap;
      align-content: stretch;
    }
    .content-flex-start {
      flex-wrap: wrap;
      align-content: flex-start;
    }
    .content-flex-end {
      flex-wrap: wrap;
      align-content: flex-end;
    }
    .content-center{
      flex-wrap: wrap;
      align-content: center;
    }
    .content-space-between {
      flex-wrap: wrap;
      align-content: space-between;
    }
    .content-space-around {
      flex-wrap: wrap;
      align-content: space-around;
    }
    .order {
      order: -1;
    }
    .flex-grow {
      flex-grow: 2;
    }
    .flex-shrink {
      flex-shrink: 3;
    }
    .flex-basis {
      flex-basis: 200px;
    }
    .flex-attribution {
      flex: 3 0 90px;
    }
    .self-auto {
      align-self: auto;  
    }
    .self-stretch {
      align-self: stretch;
    }
    .self-flex-start {
      align-self: flex-start;
    }
    .self-flex-end {
      align-self: flex-end;
    }
    .self-center {
      align-self: center;
    }
    .self-baseline {
      align-self: baseline;
    }
  </style>
</head>
<body>
  <h4>Flex-direction属性决定主轴的方向（即项目的排列方向）。</h4>  
  <span>row(默认值):主轴为水平方向，起点在左端。</span>
  <div class="flex direction-row">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
  </div>
  <span>row-reverse:主轴为水平方向，起点在右端。</span>
  <div class="flex direction-row-reverse">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
  </div>
  <span>column:主轴为垂直方向，起点在上沿。</span>
  <div class="flex direction-column">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
  </div>
  <span>column-reverse:主轴为垂直方向，起点在下沿。</span>
  <div class="flex direction-column-reverse">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
  </div>
  <hr />
  <h4>Flex-wrap属性定义，如果一条轴线排不下，如何换行。</h4>  
  <span>nowrap（默认）：不换行。</span>
  <div class="flex nowrap">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
    <div class="box">6</div>
    <div class="box">7</div>
  </div>
  <span>wrap：换行，第一行在上方。</span>
  <div class="flex wrap">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
    <div class="box">6</div>
    <div class="box">7</div>
  </div>
  <span>wrap-reverse：换行，第一行在下方。</span>
  <div class="flex wrap-reverse">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
    <div class="box">6</div>
    <div class="box">7</div>
  </div>
  <hr />
  <h4>Flex-flow属性是flex-direction属性和flex-wrap属性的简写形式，默认值为row nowrap。</h4>
  <div class="flex flex-flow">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
    <div class="box">6</div>
    <div class="box">7</div>
  </div>
  <hr />
  <h4>Justify-content属性定义了项目在主轴上的对齐方式。</h4>
  <span>flex-start（默认值）：左对齐</span>
  <div class="flex flex-start">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
  </div>
  <span>flex-end右对齐</span>
  <div class="flex flex-end">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
  </div>
  <span>center居中</span>
  <div class="flex center">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
  </div>
  <span>space-between两端对齐，项目之间的间隔都相等。</span>
  <div class="flex space-between">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
  </div>
  <span>space-around每个项目两侧的间隔相等。所以，项目之间的间隔比项目与边框的间隔大一倍。</span>
  <div class="flex space-around">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
  </div>
  <hr />
  <h4>align-items属性定义项目在交叉轴上如何对齐。</h4> 
  <span>stretch（默认值）：如果项目未设置高度或设为auto，将占满整个容器的高度。</span>
  <div class="box-wrap flex items-stretch">
    <div class="box-stretch">1</div>
    <div class="box-stretch">2</div>
    <div class="box-stretch">3</div>
    <div class="box-stretch">4</div>
    <div class="box-stretch">5</div>
  </div>
  <span>flex-start: 交叉轴的起点对齐。</span>
  <div class="box-wrap flex items-flex-start">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
  </div>
  <span>flex-end: 右对齐</span>
  <div class="box-wrap flex items-flex-end">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
  </div>
  <span>center: 交叉轴的中点对齐。</span>
  <div class="box-wrap flex items-center">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
  </div>
  <span>baseline: 项目的第一行文字的基线对齐。</span>
  <div class="box-wrap flex items-baseline">
    <div class="box" style="line-height: 10px">1</div>
    <div class="box" style="line-height: 20px">2</div>
    <div class="box" style="line-height: 30px">3</div>
    <div class="box" style="line-height: 40px">4</div>
    <div class="box" style="line-height: 50px">5</div>
  </div>
  <hr />
  <h4>align-content属性定义了多根轴线的对齐方式。如果项目只有一根轴线，该属性不起作用。</h4> 
  <span>stretch（默认值）：轴线占满整个交叉轴。</span>
  <div class="box-wrap2 flex content-stretch">
    <div class="box2">1</div>
    <div class="box2">2</div>
    <div class="box2">3</div>
  </div>
  <span>flex-start: 交叉轴的起点对齐。</span>
  <div class="box-wrap2 flex content-flex-start">
    <div class="box2">1</div>
    <div class="box2">2</div>
    <div class="box2">3</div>
  </div>
  <span>flex-end: 与交叉轴的终点对齐。</span>
  <div class="box-wrap2 flex content-flex-end">
    <div class="box2">1</div>
    <div class="box2">2</div>
    <div class="box2">3</div>
  </div>
  <span>center: 与交叉轴的中点对齐。</span>
  <div class="box-wrap2 flex content-center">
    <div class="box2">1</div>
    <div class="box2">2</div>
    <div class="box2">3</div>
  </div>
  <span>space-between：与交叉轴两端对齐，轴线之间的间隔平均分布。</span>
  <div class="box-wrap2 flex content-space-between">
    <div class="box2">1</div>
    <div class="box2">2</div>
    <div class="box2">3</div>
  </div>
  <span>space-around：每根轴线两侧的间隔都相等。所以，轴线之间的间隔比轴线与边框的间隔大一倍。</span>
  <div class="box-wrap2 flex content-space-around">
    <div class="box2">1</div>
    <div class="box2">2</div>
    <div class="box2">3</div>
  </div>
  <hr />
  <h4>order属性定义项目的排列顺序。数值越小，排列越靠前，默认为0。</h4>
  <div class="flex">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box order">99</div>
    <div class="box">4</div>
    <div class="box">5</div>
  </div>
  <hr />
  <h4>flex-grow属性定义项目的放大比例，默认为0，即如果存在剩余空间，也不放大。</h4>
  <div class="flex">
    <div class="box">1</div>
    <div class="box flex-grow">2</div>
    <div class="box">1</div>
  </div>
  <hr />
  <h4>flex-shrink属性定义了项目的缩小比例，默认为1，即如果空间不足，该项目将缩小。</h4>
  <div class="flex">
    <div class="box">1</div>
    <div class="box flex-shrink">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
    <div class="box">6</div>
  </div>
  <hr>
  <h4>flex-basis属性定义了在分配多余空间之前，项目占据的主轴空间（main size）。浏览器根据这个属性，计算主轴是否有多余空间。它的默认值为auto，即项目的本来大小。</h4>
  <div class="flex">
    <div class="box">1</div>
    <div class="box flex-basis">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
    <div class="box">6</div>
  </div>
  <hr>
  <h4>flex属性是flex-grow, flex-shrink 和 flex-basis的简写，默认值为0 1 auto。后两个属性可选。</h4>
  <div class="flex">
    <div class="box">1</div>
    <div class="box flex-attribution">2</div>
    <div class="box">3</div>
    <div class="box flex-attribution">4</div>
    <div class="box">5</div>
    <div class="box">6</div>
  </div>
  <hr />
  <h4>align-self属性允许单个项目有与其他项目不一样的对齐方式，可覆盖align-items属性。默认值为auto，表示继承父元素的align-items属性，如果没有父元素，则等同于stretch。</h4> 
  <span>auto</span>
  <div class="box-wrap flex">
    <div class="box self-auto">auto</div>
    <div class="box-stretch self-stretch">stretch</div>
    <div class="box self-flex-start">start</div>
    <div class="box self-flex-end">end</div>
    <div class="box self-center">center</div>
    <div class="box self-baseline" style="line-height: 20px">baseline</div>
  </div>
  <span>stretch（默认值）：如果项目未设置高度或设为auto，将占满整个容器的高度。</span>

  <span>flex-start: 交叉轴的起点对齐。</span>
  <span>flex-end: 右对齐</span>
  <span>center: 交叉轴的中点对齐。</span>
  <span>baseline: 项目的第一行文字的基线对齐。</span>
  <div class="box-wrap flex">
    <div class="box" style="line-height: 10px">1</div>
    <div class="box self-baseline" style="line-height: 20px">2</div>
    <div class="box" style="line-height: 30px">3</div>
    <div class="box" style="line-height: 40px">4</div>
    <div class="box" style="line-height: 50px">5</div>
  </div>
</body>
</html>
